Piston Valves

Piston valves function by a piston which moves in a cylinder.  The movement of the piston serves to open or close the valve.  The Piston has a hole through it.  As the hole moves up and down, the valve is opened and shut.  Piston valves can be used in media such a steam, water, compressed air, etc.

The valve can be mounted in the vertical or horizontal direction.  The valve has a handle which is to be rotated.  The rotation causes the piston to move in a linear direction.

Piston valves are also to be seen in musical instruments.